Same Problem, tried all solutions.
Below my setup:
Mother Board: ASUS M2N-E SLI
CPU: AMD Athlon(tm) 64 Processor 3200+
VIDEO 1: NVIDIA - GeForce 7200 GS 256MB - PCI-E
VIDEO 2: NVIDIA - GeForce 7200 GS 256MB - PCI-E
MONITOR 1: ACER AL1914
MONITOR 2: ACER AL1914
Ubuntu Gutsy Release 7.10 Fresh CD Install + Updates
Used: NVIDIA restricted drivers
Compiz
XGL
Manually configured xorg.conf
DUAL SCREEN Problems with different settings:
1. With XGL and "xinerama off" results in primary screen working and
secondary screen black but active with X cursor. Compiz runs correctly
on primary screen.
2. With XGL and "xinerama on" Top and bottom panels extend over two
screens, all opened windows appear in center of two monitors (annoying).
Compiz cube at center of both screens. Works if any body likes that?
3. No XGL and "xinerama on" results in primary screen with panels and no
panels on secondary screen but compiz will not start.
4. No XGL and "xinerama off" results in a session per screen with menus and
panels for both.
Windows cannot be moved from one session to the other (being two sessions
this is correct).
If compiz is running it runs on both screens.
Primary screen menus become very slow.
Secondary screen works fine.
Cube rotation works on both but with different settings eventhough Advanced
Desktop Effect Settings
works for both displays.
--
slow gtk popup menus with gtk dual head
https://bugs.launchpad.net/bugs/149764
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